SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7daa6b94fb4be2b28a35f807b3ef07c0d1d9e6383f6bf1e835473dd84ceb97c' 
  AND token = 'zFG3/VHo5rsapIRnEZsn2Sm0X+XDgpMMYYAPYpsgUhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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