Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6d6b953a67786f2775ecd755c2b0943c25273ec01076ee1e262ce18f430f5d' 
  AND token = 'komr4RAJH4mkM72N8Nej31WVJCUgpHm5iUR7pvsRwA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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