SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ee2825924e27f611efaddf7d8c5877ddf41899748dde2deb93847045df7e63' 
  AND token = '0F+nDy0BnBOFGHjgzX5rKgg+JAJ2IZ1hpem1oFoZVVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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