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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f51dead643e29c50284736c4e8d15a7b5790902a6b589829a06e1385b7085d4' 
  AND token = 'UT5zwqAM4sfGPFa1ZvWPCfCfA2HzAgvxjMGHyizO14k=' 
  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"
    }
  }
}