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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bbed2d733694d61dff05b066126a3ae6f7200264423d1e6611694479df8c75' 
  AND token = 'PYKOPUtBAdKMYHLeDke5z79efOUionCKu/zNUg2C+jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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