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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c347a3f7dfe8f8d2defe4f0f505b70c4c9c830ee7c74e8a4ac47902f04c353' 
  AND token = '+Y4QUvS83bMzMSIPtv2TrblhTRE8Jg1DGikJ/XbUE6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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