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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49421636a34c92400187b3499cbc275dff30d9609431b3cad136614d66a0d068' 
  AND token = 'd5mDPWpbAVGuMUzvRXRu3APtUe5i/atSZM8WDGZvB4U=' 
  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"
    }
  }
}