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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4079fa33ae3ae54251ce586315c1842e71184870b82057d8c4d83b175e4eefac' 
  AND token = 'QJhWwjUi17zUeth7MVpKciNKg8a/pff9fIZckqRWom4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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