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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ccf6662c41a9545da3d73c8233b9329d1a1cbd691f87f7e6e96d027d7dbf65' 
  AND token = 'UxAXSutD3hnmvWgSJiLfLTMFYh9ypZKpW2Am0thEZ6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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