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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7797112a172e98a7b7c7719814b5d72f1a10bd2bfc99e3112d2fefc4f839a694' 
  AND token = 'uNcscUVcWzAERIE7nBUZ7i+/7wHl/DcuE4l3O8B8Xhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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