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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff1c7f6186167e5a72876452dc4c625a68f4202de0c38ee148e5691c597e96a' 
  AND token = 'Js5llCLdlnukfa5eaXJtkn73fBvV0N6efMehb4gC/eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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