Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156cbea89ee6786d15ebfbb82b961de06e3d020a09e6dd99857d2a8f4e4980c7' 
  AND token = 'U6BHdhXln41ZaH4mIdEfQZVHbFIwLfQpSbUkUPAbpNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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