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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43667217edac7c2c54567c7dfc5470a0e3a4b0b6f7ab43af32a4186fff4a1417' 
  AND token = 'VY4mT/kld4dNRYnzI4pk4G3Ypxs3HT9uIMoSo7IZ+eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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