SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea74c96e853cb8703d89135d351cb19f0f46e9f99b81ffe72c2d65b3d23b04b' 
  AND token = 'Yi+5gnmbrns7c6N1HFYDurKFjOiZwlzxFicAQhajEDM=' 
  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"
    }
  }
}