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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d3461830ac128e10e6b14e06e69ccd0835a1d735111f17c2316ccf1e4a5d26' 
  AND token = 'YkcPRsOdMdmCUv6N1ihja1XzA83GBcYEqhNuX+gxI3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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