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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3961032d52fb07793c9cc9faee8aaef2de874e8b407be95dc2b5dfb2b9bf9e10' 
  AND token = 'oz5vTDt663if9zIKEBrDMqA0sMYncmcP8MgFcUc9nlA=' 
  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"
    }
  }
}