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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc0d8e26fbb5488dc8a38ea72542af0b142a30ac73c835919fdb01558af8a4e' 
  AND token = 'cNlgjEyopw46AX3fSHB5iu7si9HS+6tUX3HYHKL4lyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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