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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654ea7e61b2d773238b6bd9c0c0d459ea17b07f5f05d1d6f0008378637475b2d' 
  AND token = 'ScrnMQXh8OSCM1XxThrTxNz405FJZwmQ0neYp3SQjs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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