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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbbc04fbc37579a65e0e5ce1cce22e0e64c3a254ef5f14736f205c05fb25861' 
  AND token = 'B9T7EZzud0bbp3s7Q6lncaM4UdIQEC0EsXF5XJ+X5AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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