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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f853e49073ec93b3f4ef116f9a7be4cbef8479fafbb2af0ec641de9fd455e1b' 
  AND token = 'HPj5A7sJ7xNDTs29G4Im5/5faU/MDFNRpXlCyKCjUKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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