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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da0b6897f66b403a2b70900116af9c5c54557375474fa74575a7ee296377580' 
  AND token = 'wUFgdC+/6X2SdVkM0F8/p7FlyvWK04ex5NxQ9ysbYbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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