SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48ca7cce89a871442b26c2d0d1509c323e09efee1743c2c7e6e601033044381' 
  AND token = 'jFKKV/3bv1c/GKY++t/RSmJrfvy+kqXLzMz5MiYZf8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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