Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50707835b14767109bf904efa3e0e0ea32f135b268d84db9058fc97dba000900' 
  AND token = 'qQDL7J9ar4cfNhDSFu+8bVY/gfVwAVTQhSyHzQFNIY4=' 
  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"
    }
  }
}