SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65fd49038b6d4236977d1d9a965f4c947cc4097f0127fde33906e12ac3d2eb0' 
  AND token = 'Q9qpWRVV0HK92kTg8AFpyUjPMGgwcbtj7C9JSa+UXLw=' 
  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"
    }
  }
}