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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fde04808a3b408ceaae8a48e9bf295a536c1e5e4e22cd750442cb509f697356' 
  AND token = 'UF5NYWsz133gsb23RxpuE9aRm+X3I+usbLkRN1zOFpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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