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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bf4edb271cefbeafd5749167fb79c80ff828116a92c9f0b8a4b5a4b899cd81' 
  AND token = '4EfE92ETKR7y9HewfQpMGYMD4x5z7acuhWUZdXp7Dno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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