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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac9f51a6c4e807bec751f525498e6ba31f8d0806b8c5fb427c8de112bbad289' 
  AND token = 'O222X9mIVdl6nrVqHqkwX5iLskPSmu3JvYXklFv3frw=' 
  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"
    }
  }
}