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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d727040eea7140928eedc737cbd6c27402249976fd801d98122af3ce9f3a70' 
  AND token = 'oI7ExtrGEGsCKdQQKTX1+r3uaj1o7jHkN655AAuBN1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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