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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb3fd88f14e6f100ae190970d73b3fe5310f36e96dad087c9861d5355cbfbb5' 
  AND token = 'UYRMp+MsKG92wtwbM/bFcjO2smR5fo+LHhts8F6eV2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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