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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591545e474b3fe96f58e29a1b7482eae86245c3b7c9e7f3dcc101edc2b3cf70c' 
  AND token = 'LfwA4wPX4kS2ImNiCBD+La4mRP6kKBFp6c4/mGTmdo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}