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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1576e55b404f1b1051cc5fb0a8c5dc07037f5006463c1d75032ab21abdc98a' 
  AND token = '/bPo9qvctfE/nIQLii7gMTNHeTFG9QwGTDBJ1aNH0Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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