Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540d15faa34d0fca00ab7fd5ff7b19fa4873fd0a5134edd99b301df6b0fbd3af' 
  AND token = 'pTzQn0Ixxhpogr1rlJJHV2U6OoJ/uSV+FOUznKDTTkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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