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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320348ee0a185e09c5fc477936f2d60f9dcadd33c850aced08828bee26a80938' 
  AND token = 'A5lL5K8NBi/ju9cG3s8svaLWlIf3mP44k1J7RMqL6Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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