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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ecdb872b51692dcc00801b57b883c3db77efccf9b4b341c12fb72b5477c5458' 
  AND token = 'HVlIQyV23/W35gAbxJWHSsqy1nFFzVJ4KP1E9FIyaAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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