SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a117856c210c00aa7cdbdf44c6808c4f6f82fe088cb8bfb692e937f9b08c1e' 
  AND token = 'TDmkWkAYgh0soCwRmN3VrqBiam1u9YGywSJKKNsLYZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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