SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb317d16596d89e78b8c185f553df942f1c5e5157756264703dc57fbcc230174' 
  AND token = 'eMYwuIzKIMlnPZHfS+rB5wDvw7nonNS/wgJ172zds5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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