SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c07bc15ece136ff577e1f2202f46135de4b86f9644a490ef5b75ace2800de1' 
  AND token = 'BK8mqIgP2BGMguKzUkX0Ew+dEtq3gRYhgBeLvLm6/SE=' 
  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"
    }
  }
}