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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b13b738918d4c59df1486a2ad743e2ef4fa6e3424f0f92b7d5301300ba51778' 
  AND token = 'cUYDIa2v8wkg0dNNI/1Jh2VUtxOU2lH8S6/GwaFBp68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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