SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9e81a82474fef2391fac18aca4ce32c526b30c2d8738c13b17496e548643be' 
  AND token = 'N9HhZHGknvlGCBd2tL+xR5H0d1VdGdRLP1wiYLJgZdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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