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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a1fafa2c061e4bf6d36444879baa9f6f55b27638588098a53da29d8f1e0f6e' 
  AND token = 'Lyw8zyPCJ95xoZbNqYzzM6dUW7Us5Ktyq7CWGsStUvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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