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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567840e2b77017efc7800e09084c52dcdf03bb1ab3a7709ff0a6264c3f3c364e' 
  AND token = 'FVxNksBNqL7GMcApjwDE+SJqpzYBUAET/x9s2HnisrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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