Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140ebb91d0c6bb023da5a3d4b29d8ff191d0376994747fb51c4e45412db6ee11' 
  AND token = 'z0zYMVL5WDdlfmmBE3zZur38Td+axiPS0ohwmE/gWwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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