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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138278c9cbc7d25f53879219df19b713211f8954cdcfc3225dffaff771c7ef23' 
  AND token = 'CKT4Q/Tg/Qis6ws4xxYqTowAEkj0UnhnhXmOMQPnfxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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