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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ac5e07c123d4d19a18083544ef12bb60f4da69803a56cd7d6aaf0552cfdd1f' 
  AND token = 'e0drMU+bgT3tr3gClCYtSA1ihAxVv/vDL4P8X7pJRfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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