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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df42ff7aff5d4c8cc1a7fa990e06ebd1dad629650a6c186a529457a37cacfb4' 
  AND token = 'HwOfUDYXOdDIM9VBkxQQCvi3qF/U+KZaN4CV/b1Cc0Y=' 
  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"
    }
  }
}