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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e899bf978e2461e1570a5c1718f82abf981e76e7ef55f1d751e58e7b41ba71a1' 
  AND token = '542u6Kq6okcNInvmRVQEeumzCyKLE14sn6HXI+p/stY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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