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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e02801bf73290f4461e1cf39a7ed0b0a8ea57f8c186be9eef53b3becc0ddb5' 
  AND token = 'UFBpcfI2nUpHG/4ZFIoq7nfpphr870jul3SzSFevfuQ=' 
  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"
    }
  }
}