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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff29485c2c9179ef3a2d7d2f23806c1f1602aaa3c537da779c543ac219a82ddf' 
  AND token = '8aK65+U9JHv1w7LxNgFxe9xda8FWcaFbDNeVaEymsMI=' 
  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"
    }
  }
}