SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bb5ada69fbe369b2571a5624de0a083b39557ad0b2939898d6c5d36b258ace' 
  AND token = 'FRyH1Drmr/n6YV3hgoPfZQ9yABYg+tX4xEzxJ2McBu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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