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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d93b7ba459e9e6a4ef64f75d4805eeed7de54b4737c4e12fbe652b820f6ae6' 
  AND token = 'dSHz8ppLujyTj+cuexZ/6THnuTO2ndooIY+BjAt/AWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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